The Type II U-boat was designed by Nazi Germany as a coastal U-boat, modeled after the CV-707 submarine, which was designed by the Dutch dummy company NV Ingenieurskantoor voor Scheepsbouw Den Haag (I.v.S) and built in 1933 by the Finnish Crichton-Vulcan shipyard in Turku, Finland. It was too small to undertake sustained operations far away from the home support facilities. Its primary role was found to be in the training schools, preparing new German naval officers for command. It appeared in four sub-types.
German submarine U-20 was a Type IIB U-boat of Nazi Germany's Kriegsmarine. Her keel was laid down on 1 August 1935, by Germaniawerft of Kiel as yard number 550. She was commissioned on 1 February 1936. During World War II, she conducted operations against enemy shipping.
German submarine U-51 was a Type VIIB U-boat of Nazi Germany's Kriegsmarine that operated during World War II. She was ordered on 21 November 1936 and laid down on 26 February 1937 in Kiel. She was launched on 11 June 1938 and commissioned on 6 August 1938.
German submarine U-49 was a Type VIIB U-boat of Nazi Germany's Kriegsmarine during World War II. She was ordered on 21 November 1936 and laid down on 15 September 1938 at the yards of Friedrich Krupp Germaniawerft AG in Kiel as yard number 584. Launched on 24 June 1939, she was commissioned on 12 August and assigned to the 7th U-Boat Flotilla under the command of Kurt von Goßler.
German submarine U-34 was a Type VIIA U-boat of Nazi Germany's Kriegsmarine during World War II.
German submarine U-99 was a Type VIIB U-boat of Nazi Germany's Kriegsmarine during World War II. She was laid down on 31 March 1939 at the Friedrich Krupp Germaniawerft in Kiel as yard number 593. She was launched on 12 March 1940 under the command of Korvettenkapitän Otto Kretschmer and was assigned to the 7th U-boat Flotilla based in Kiel and later in St Nazaire.
The German submarine U-41 was a Type IXA U-boat of Nazi Germany's Kriegsmarine that operated during World War II. She conducted three war patrols during her short career, two as part of the 6th U-boat Flotilla and one as part of the 2nd flotilla. U-41 also sank five enemy vessels for a total of 22,815 gross register tons (GRT); captured two more for a total of 2,073 GRT and damaged one other of 8,096 GRT.
German submarine U-30 was a Type VIIA U-boat of Nazi Germany's Kriegsmarine that served during World War II. She was ordered in April 1935 in violation of the Treaty of Versailles, which prevented the construction and commissioning of any U-boats for the German navy, and as part of the German naval rearmament program known as Plan Z. She sank the liner SS Athenia (1922) on 3 September 1939, under the command of Fritz-Julius Lemp. She was retired from front-line service in September 1940 after undertaking eight war patrols, having sunk 17 vessels and damaging two others. U-30 then served in a training role until the end of the war when she was scuttled. She was later raised and broken up for scrap in 1948.
German submarine U-46 was a Type VIIB U-boat of Nazi Germany's Kriegsmarine during World War II. She had a highly successful career during the war.
German submarine U-137 was a Type IID U-boat of Nazi Germany's Kriegsmarine in World War II. Her keel was laid down on 16 November 1939 by Deutsche Werke in Kiel. She was launched on 18 May 1940 and commissioned on 15 June 1940 with Oberleutnant zur See Herbert Wohlfarth in command.
German submarine U-44 was a Type IXA U-boat of Nazi Germany's Kriegsmarine that operated during World War II. She was ordered in November 1936 and laid down in September 1938 in Bremen. She was launched in August 1939 and commissioned in November.
German submarine U-138 was a Type IID U-boat of Nazi Germany's Kriegsmarine in World War II. Her keel was laid down on 16 November 1939 by Deutsche Werke in Kiel as yard number 267. She was launched on 18 May 1940 and commissioned on 27 June 1940 with Oberleutnant zur See Wolfgang Lüth in command.
German submarine U-57 was a Type IIC U-boat of Nazi Germany's Kriegsmarine that served in the Second World War. She was built by Deutsche Werke in Kiel as yard number 256. Ordered on 17 June 1937, she was laid down on 14 September, launched on 3 September 1938 and commissioned on 29 December under the command of Oberleutnant zur See Claus Korth.
German submarine U-203 was a German Type VIIC submarine U-boat built for Nazi Germany's Kriegsmarine for service during World War II.
German submarine U-58 was a Type IIC U-boat of Nazi Germany's Kriegsmarine that served in the Second World War. She was produced by Deutsche Werke AG, Kiel. Ordered on 17 June 1937, she was laid down on 29 September as yard number 257. She was launched on 12 October 1938 and commissioned on 4 February 1939 under the command of Oberleutnant zur See Herbert Kuppisch.
German submarine U-453 was a Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was laid down on 4 July 1940 by Deutsche Werke in Kiel as yard number 284, launched on 30 April 1941 and commissioned on 26 June 1941 under Kapitänleutnant Egon-Reiner von Schlippenbach.
German submarine U-59 was a Type IIC U-boat of Nazi Germany's Kriegsmarine that served in the Second World War. She was built by Deutsche Werke AG, Kiel. Ordered on 17 June 1937, she was laid down on 5 October as yard number 258. She was launched on 12 October 1938 and commissioned on 4 March 1939 under the command of Oberleutnant zur See Harald Jürst.
German submarine U-60 was a Type IIC U-boat of Nazi Germany's Kriegsmarine that served in the Second World War. She was built by Deutsche Werke AG, Kiel. Ordered on 21 July 1937, she was laid down on 1 October that year as yard number 259. She was launched on 1 June 1939 and commissioned on 22 July under the command of Oberleutnant zur See Georg Schewe.
German submarine U-61 was a Type IIC U-boat of Nazi Germany's Kriegsmarine that served in the Second World War. It was built by Deutsche Werke AG, Kiel. Ordered on 21 June 1937, it was laid down on 1 October as yard number 260. It was launched on 15 June 1939 and commissioned on 12 August under the command of Oberleutnant zur See Jürgen Oesten.